Lexus GS300/400 (2000 year). Manual — part 60
1
Radio
RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO ”ON”
+ B wire harness faulty.
GND faulty.
Power amplifier or ACC wire harness faulty.
Power amplifier or +B wire harness faulty.
GND faulty.
Is tape player operating normally?
Check if RAD–No.2 fuse is OK?
Is power supplied to ACC terminal of power amplifier?
Yes
NG
No
OK
No
No
No
No
OK
OK
OK
Yes
Yes
Yes
Yes
NG
NG
NG
Check if RAD–No.1 fuse is OK?
Radio assembly faulty.
Replace fuse.
ACC wire harness faulty.
Check if GND (wire harness side) to radio assembly is OK?
Radio assembly faulty.
Replace fuse.
Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?
Is power supplied to +B terminal of radio assembly?
Check if GND (wire harness side) of power amplifier
grounded normally?
BE–198
–
BODY ELECTRICAL
AUDIO SYSTEM
2499
2
Radio
DISPLAY INDICATES WHEN POWER SWITCH TURNED TO
”ON”, BUT NO SOUND (INCLUDING ”NOISE”) IS PRODUCED
+ B wire harness faulty.
GND faulty.
Power amplifier faulty.
Speaker wire harness faulty.
GND faulty.
Is tape player operating normally?
Check if RAD–No.2 fuse is OK?
Yes
NG
No
OK
No
No
No
No
OK
OK
OK
Yes
Yes
Yes
Yes
NG
NG
NG
Check if RAD–No.1 fuse is OK?
Radio assembly faulty. Recheck system after repair.
Replace fuse.
ACC wire harness faulty.
Radio assembly faulty.
Replace fuse.
Does continuity exist in speaker wire harness?
Temporarily install another speaker. Functions OK?
Hiss noise from speaker?
Yes
Yes
No
No
No
Yes
Power amplifier faulty.
Power amplifier faulty.
Recheck system after repair.
Speaker faulty.
Is power supplied to ACC terminal of power amplifier?
Check if GND (wire harness side) of power amplifier
grounded normally?
Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio receiver?
Is power supplied to +B terminal of radio receiver?
Check if GND (wire harness side) of power amplifier
grounded normally?
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–199
2500
Speaker wire harness faulty.
Is tape player operating normally?
Yes
No
Radio assembly faulty.
Recheck system after repair.
Radio assembly faulty.
Temporarily install another speaker? Functions OK?
Power amplifier faulty. Recheck system after repair.
Speaker faulty.
4
Radio
ANY SPEAKER DOSE NOT WORK
Is hiss noise produced by non–functioning speaker?
Does continuity exist in speaker wire harness?
Yes
Yes
No
Yes
No
No
3
Radio
NOISE PRESENT, BUT AM–FM NOT OPERATING
Go to No.25
Radio faulty.
If radio side faulty.
BE–200
–
BODY ELECTRICAL
AUDIO SYSTEM
2501
5
Radio
ANY AM OR FM DOES NOR WORK
FEW PRESET TUNING BANDS
Problem with radio wave signals or location?
Are both AM and FM defective?
Radio assembly faulty.
Go to No.16
Is tape player operating normally?
Radio assembly faulty.
Is power for the antenna being output from the radio assembly?
Hiss noise from speaker?
Temporarily install another speaker. Functions OK?
Radio assembly faulty. Recheck system after repair.
Speaker faulty.
Power amplifier faulty.
Recheck system after repair.
Poor signals, poor location.
No
Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–201
2502
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